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Simplifying 3x2 + -9x = x + -20 + 3x2 Reorder the terms: -9x + 3x2 = x + -20 + 3x2 Reorder the terms: -9x + 3x2 = -20 + x + 3x2 Add '-3x2' to each side of the equation. -9x + 3x2 + -3x2 = -20 + x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -9x + 0 = -20 + x + 3x2 + -3x2 -9x = -20 + x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -9x = -20 + x + 0 -9x = -20 + x Solving -9x = -20 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -9x + -1x = -20 + x + -1x Combine like terms: -9x + -1x = -10x -10x = -20 + x + -1x Combine like terms: x + -1x = 0 -10x = -20 + 0 -10x = -20 Divide each side by '-10'. x = 2 Simplifying x = 2
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